Thanks! I do mean decks that can be found <$15 that can also be found higher, as well as decks that are always lower.
In that case:
Anything Uusi (Blue blood, bohemias Optiks, BB redux and pagans are what they're released to this point in time)
Encarded (they're all great but I think only the aurums and decos can be got for <$15)
Ellusionist: Love the artifice purples
Theory11: Monarches, medallions and Black JAQKs all the way
I don't know how you handle international - but the way I try to handle is by buying a large amount at once to reduce the shipping cost per deck and then opening them slowly haha. Ie I would probably buy 12 decks at once then open one a month rather than have to pay itnernational shipping 12 times. If I could jsut walk down to a local card store and find decks I would do that... but it's Australia we have no physical card stores haha XD.